Can a septict tank outlet

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i had the septic tank pumped and i replaced the pipe between the cleanout and the tank. it was dissconected and from the tee and would get plugged with tree roots. i was able to get that fixed. i left the tank lid and the pipe exposed so a plumber could inspect it for leaks. between now and mid november it over flowed once. the fluid level in the tank seems to stay around 7 inches from the top. i want to dig and c if there is a clean out for the outlet side of the tank but im not sure were to digg. its a older house and i dont know if it even has one for that end.